Manufacture of rubber-faced type-wheels



No. 606,765. Patented'luly 5,1696. 1. s. 06min.

MANUFACTURE 0F RUBBER F`ACED TYP-E WHgEELS. (Applcntion med June 25,1897.) (No Model.)

2 Sheets-Sheet I.

No. 606,765. Patented July 5, |698.

1. s. '06m-:M v MANUFACTURE 0F RUBBER FACED TYPE-WHEELS.

' (Application led June 25, 1897.)

'- (Nofmodem 2s 11111 S-sheetz.

Ai, wza ffy/f y UNITED STATES PATENT EETCE.

JOHN s. OGDEN, OF BROOKLYN, NEw YORK.

NINUFACTURE OF RUBBER-FACED TYPE-WHEELS.

SPECIFICATION forming part of Letters Patent No. 606,76 5, dated July 5,1898. Application filed J une 25, 1897. Serial No. 642,280. (No modell)T LZ whom t muy concern,.-

Be it known that I, JOHN S. OGDEN, of Brooklyn, in the county of Kingsand State of New York, have invented certain new and useful Improvementsin the Manufacture of Rubber-Faced Type-Vheels, of which the followingis a specification, reference being had to the drawings accompanying andform-` ing a part of the same.- l

The invention which forms the subject of my present application forLetters Patent is an improvement in apparatus for the manufacture ofrubber-faced type-wheels-such as are employed in printing-telegraphinstruments, type-writers, and the like-or, in general, any articlewhich possesses the essential characteristics of a type-wheel in being acircular or cylindrical body having a peripheral surface of vulcanizedindia-rubber with distinctive characters embossed thereon.

It has heretofore been a matter of considv erable difficulty and expenseto produce a ties and complications heretofore encountered.

in such manufacture and have devised apparatus for producing thesedevices cheaply and accurately.

My improvement consists in an apparatus involving as its chiefcharacteristic a flexible or resilient matrix-strip which is adapted tov be applied to a type-wheel faced with crude india-rubber in suchmanner that the latter will be enfolded within the strip and the rubberforced into the depressions in the said strip, and the strip is of suchcharacter or' composition that the rubber facing may beV vulcanizedwhile thus encircled by the strip and the latter then unfolded anddetached. In conjunction with the strip VI employ suitable means,preferably of the special charac-` ter hereinafter more fully described,for compressing the strip around the rubber-faced wheel during theprocess of vulcanization.

I now refer tothe drawings for a description of my improvement and ofthe manner of producing and applying the matrix.

Figure l is a plan view, with a portion of -the cover removed, of thedevice which I emvplan View ofthe mold for the type-wheels.

Fig. '7 is a central longitudinal vertical section ofA the same. Fig. 8is a plan view of a type-wheel previous to the formation of thecharacters, and Fig. 9 shows the complete wheel.

The lirst step necessary in carrying out the invention is .to produceadie or what is usually termed an original wheel, with characters on itsperiphery corresponding to those which are to be ultimately formed onthe rubber facing of the type-wheels. This die I make as shown in Figs.l to 4. It is composed of metal with top and bottom plates ce a andeight intermediate sections with a hole through the center equal'indiameter to the width of the four sliding or radial sections Z) o. Thedie is held together by screws o and forms a practically solid ring withthe 'raised characters cut on its periphery. From this die I formamatrix as the next step in the following manner:

0A is a metal box containing two sliding Y blocks A', recessed at theirends and adj ust able by means of a set-screw B and a clamping-screw B'..In the bottom of the box is a hole through which is passed a centeringand steadying pin C. O ver this is passed the sectional die, which restsupon a boss or circular elevated portion (1Q-which serves asacentering-support for the, matrix-mold. This latter is a met-al ring D,which is fitted over the boss C around the die. Around its upper edgenotches D are out to form passages for the metal into the mold. A coverE is then placed over the mold, having notches D" in its edgeregistering with notches D'. The

box A is then closed by a cover `A,faste ned by screws a and having anopening with a threaded bushing E',the beveled end of which abutsagainst the correspondinglybeveled IOO edge of the cover E and centersand clamps firmly in position the die and the mold. The opening in thecover A"l is then closed by a cover E, having a tube F passing throughitand extending upward for perhaps two or three feetin order that when themolten metal is poured down through it into the mold there may besufficient pressure to force the said metal into all parts of the moldand prevent air-holes.

The metai used for the matrix may be typemetai or any other suitable forthe purpose which has a certain amount of resiliency or flexibility.\Yhen it has been poured into the space above the cover E, it runs downthrough the passages provided therefor into the annular space betweenthe die andthe mold, filling such space, as shown in Fig. 3.

After the metal has cooled, the casting or matrix, with the sectionaldie, is removed from the mold, the end plates oi' the die detached byloosening the screws c, andthe die then taken out by sections, which maybe accomplished by first pushing out the center ping C and then sliding`the radial sections Z) toward the center, as shown in Fig. 4t. Thematrix G will then be in the form of a ring. This is split, as shown inFig. 5, and secured to the inside of a split metal ring or backing G',which has sufficient resilience to open slightly when not underpressure.

The next step is to mold the characters on the rubber facing of thetype-wheels. For this purpose I use the same box A or one similar to it.'lhe type-wheel or type-wheels N have a strip of unvulcanized rubber liwound around their peripheries, as indicated in Fig. 8, and are placedover a centeringspindle K. In order to prevent movement or displacementof the wheels, they are strung on the spindle K, together with a numberof metal washers L, and the enlarged lower end of the spindle insertedin the holein the bottom of box A. The split ring G', with the matrixattached thereto,is then placed around the typewheels and the blocks Aadjusted by the screws B B so as to compress the ring G until its edgesclosely abut. The diameter of the boss C should be just equal to theinternal diameter of the ring G when closed, so as to center the latterand distribute the pressure upon the rubber faced wheels evenly. A screwplug M, through which passes the centering-spindle K, is then in iserted in the opening in the cover A and screwed down upon andinto thering G. ily this means a heavy and even pressure is applied to the softand cru de rubber,wliich forces it into the recesses in the matrix.After this has been done and as the filial step the box A and all itscontents are subjected to a temperature sufficient to vulcanize therubber facings of the type-wheels, after which the parts of the mold aredetached. As soon as the pressure of the blocks A upon the split ring Gis relieved the latter opens and the rubber facing of the type-wheelsstrips oft from the matrix. rlhe finished wheels, as shown in Fig. f),may thus be readily detached from their matrices.

Type-wheels prepared in this way are remarkably exact and print a clearrecord. The cost of manufacture is very greatly reduced and thedifficulty experienced in the use of sectional molds entirely avoided.

XVhat I claim as new, and desire to secure by Letters Patent, is-

l. A resilient or flexible matrix for making rnbber-faced type-wheelsadapted to be folded or wrapped around the rubber-faced wheel and tocompress the crude rubber when completely encircling the same, as setforth.

A resilient or flexible matrix for making rubber-facedtypeAwheels,adapted to be folded or wrapped around the rubber-facedwheel and to compress the crude rubber when completely encircling thesaine, in combination with means for holding the matrix in position onthe wheel while the rubber is undergoing vulcanization, as set forth.

3. A matrix for rubber-faced type-wheels in the form of a resilientsplit ring` adapted to encircle the rubber-faced wheel, as set forth.

i. The apparatus for making rubber-faced type-wheels comprising incombination, a box A, blocks A adjustable therein, and a splitringmatrix, adapted to encircle a rubber faced wheel and to be compressedthereon by the blocks A', as set forth.

5. The combination of the box A, the adjustable blocks A', thesplit-ring matrix, the centering-spindle l( andthe screw-plug M, as setforth.

JOHN S. OUDER lVitnesses:

M. Lawson Dvnn, B. M1 LLnn.

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